Effects of TaSi2 addition on room temperature mechanical properties of ZrB2-20SiC composites
Effects of TaSi2 addition on room temperature mechanical properties of ZrB2-20SiC composites
复制标题
TaSi2添加对ZrB2-20SiC复合材料室温力学性能的影响
DOI：
10.1016/j.ceramint.2018.05.075
复制
发表时间：
2018-10
影响因子：
5.2
通讯作者：
Mei-shuan Li
中科院分区：
文献类型：
--
作者：
Yang Yang;Yu-hai Qian;Jing-jun Xu;Mei-shuan Li
研究了添加TaSi2对ZrB2-20SiC(体积分数，%)复合材料室温力学性能的影响。采用热压法制备了致密的 = -20SiC-xTaSi2(x-TaSi3，6，10)复合材料，其温度为1850-1900 °C，Ar压力为30 。在所制备的复合材料中，除ZrB_2、碳化硅和TaSi2外，(Zr，Ta)B_2固溶体还存在于ZrB_2颗粒周围。随着TaSi2含量的增加，涂层逐渐变得连续，厚度逐渐增加。当TaSi2的加入量在3~10%范围内时，材料的维氏硬度略有下降，约为1~2 Gpa，但弯曲强度和断裂韧性却同时提高了35%以上。这些现象可归因于TaSi2的硬度较低、ZrB2晶粒尺寸变小以及在其周围存在连续的(Zr，Ta)B2固溶体层。
The effects of TaSi2addition on the room temperature mechanical properties of ZrB2–20SiC (volume fraction, %) composite were investigated. Dense ZrB2–20SiC-xTaSi2(x = 3, 6, 10) composites were prepared by hot pressing the mixture of ZrB2, SiC and TaSi2powders at 1850–1900 °C under 30 MPa in flowing Ar. In the as-prepared composites, apart from ZrB2, SiC and TaSi2, (Zr,Ta)B2solid solution also existed around ZrB2grains. It became a continuous layer and the thickness increased gradually with the increase of TaSi2content. When the addition of TaSi2was within the range of 3–10%, Vickers hardness of ZrB2–20SiC reduced slightly by about 1–2 GPa, but the flexural strength and fracture toughness increased simultaneously by more than 35%. These phenomena could be attributed to the relatively low hardness of TaSi2, and the decrease of ZrB2grain size as well as the presence of a continuous (Zr,Ta)B2solid solution layer around ZrB2grains.
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